▶ 10.6 Network Applications

Most of us are familiar with web browsers and email clients; we know how to visit websites and send email. Both of these, however, illustrate only half of the networking task: Web pages must reside somewhere and email messages must be delivered somehow. Web and email services operate in a mode called client/server. Our desktop or laptop host (the client) requests a network service from a distinctive host (the server) with the hardware and/or software to provide that service (FIGURE 10.21).

A sequence diagram depicts a client requests service and server replies. The sequence of events represented are Client sends a request to the server. After the request reaches the server, the server sends the reply to the client.

FIGURE 10.21 A client requests service and the server replies.

For example, when Bob wants to print on the shared printer, ...

Get Elementary Information Security, 3rd Edition now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Start your free trial